A system for controlling a power signal for zero voltage switching (ZVS) includes a voltage zero crossing detection module to detect a zero voltage condition in response to an inverter voltage from a resonant inverter crossing zero volts, and a current zero crossing detection module to detect a zero current condition in response to an inverter current from the resonant inverter crossing zero amps. The system further includes a phase detect module to detect actual phase data corresponding to an actual phase angle between the inverter voltage and the inverter current based on the zero voltage and zero current condition. The system further includes a comparator to determine a phase difference between a desired phase between the inverter voltage and the inverter current and the actual phase angle. The system further includes a controller to adjust a property of a resonant inverter to reduce the phase difference.

A multi-imaging mobile, airborne sign system, printed or electronic, hosted aloft by multiple means of aircraft, including those lighter than air.

A multi-imaging mobile, airborne sign system, printed or electronic, hosted aloft by multiple means of aircraft, including those lighter than air.

Methods and systems are provided for autonomously operating a retractable lighting arrangement. One method involves obtaining a current speed of the vehicle when the lighting arrangement is in an extended state, and when the current speed is greater than a threshold when the lighting arrangement is in the extended state, verifying one or more illumination elements associated with the lighting arrangement are in a deactivated state and thereafter automatically signaling an actuation arrangement associated with the lighting arrangement to transition the lighting arrangement from the extended state to a retracted state.

Methods and systems are provided for autonomously operating a retractable lighting arrangement. One method involves obtaining a current speed of the vehicle when the lighting arrangement is in an extended state, and when the current speed is greater than a threshold when the lighting arrangement is in the extended state, verifying one or more illumination elements associated with the lighting arrangement are in a deactivated state and thereafter automatically signaling an actuation arrangement associated with the lighting arrangement to transition the lighting arrangement from the extended state to a retracted state.

Systems and methods are disclosed for transporting people using air vehicles.

Systems and methods are disclosed for transporting people using air vehicles.

A system for improving an appearance of light from an excimer lamp includes the excimer lamp configured to output excimer light that includes ultraviolet light having an ultraviolet wavelength and visible light having a first visible wavelength or spectra. The system further includes at least one additional light source configured to be packaged with the excimer lamp and to output additional light having a second visible wavelength or spectra. The system further includes a cover that is at least one of transparent or translucent to the ultraviolet wavelength and having a surface pattern that causes the excimer light to blend with the additional light.

A sanitization system for an aircraft may comprise: a lighting system disposed in the aircraft cabin, the lighting system including a plurality of sanitization lights, the plurality of sanitization lights configured to emit UV-C radiation; an electrical port in electrical communication with the lighting system; an external power source disposed away from the aircraft; and an electrical cable coupled to the external power source, the electrical cable configured to removably couple to the electrical port to provide electrical power to the plurality of sanitization lights.

A sanitization system for an aircraft may comprise: a lighting system disposed in the aircraft cabin, the lighting system including a plurality of sanitization lights, the plurality of sanitization lights configured to emit UV-C radiation; an electrical port in electrical communication with the lighting system; an external power source disposed away from the aircraft; and an electrical cable coupled to the external power source, the electrical cable configured to removably couple to the electrical port to provide electrical power to the plurality of sanitization lights.